Hook



FIG. 1 is a perspective view showing a hook according to my new design;

FIG. 2 is a top plan view thereof, the bottom being identical;

FIG. 3 is a left side elevational view thereof, the right side elevational view being identical to said left side view;

FIG. 4 is a front elevational view thereof; and

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a hook, substantially as shown and described. 